Torque measuring tool



Aug- 16, 1949- c. E. GossLlNG TORQUE MEASURING TOOL Filed sept. 15, 1945.

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Patented Aug. 16, 1949 UNITED STA-TES PATENT r Yor PlcEi-i y, Y 2,479,230

. TQRQUEMEASURING rrooL s' Clement E. Gossling, Toronto, Ontario, Canada i VApplsieetion september V15, 1945, serial No. 616,513 f The present invention relates to improvements in tools for applying a turning force to bolts, nuts, screws or other pieces of mechanism where it is desired to accurately apply a desired torsional loading so that the piece being tightened will not y be subjected to undesirable or injurious stress and the principal obj ect of the invention is to provide anextremely simple form of tool which may be universally applied to various uses and will be free of delicate mechanisms which may-become distorted and inaccurate through use and abnormal conditions. I

A further and important object is to devise a construction of tool which will enable its being produced in quantity at relatively low cost, thereby enabling a much wider range of use than tools having delicate mechanisms liable to get out of order.

The principal feature of the invention consists in the novel arrangement of a torsion member xed at one end in the tool handle and connected at the other end to the load applying element, and registering with fixed gaugemarkings arranged longitudinally of the handle structure to indicate the torque applied through the torsional deflection of said torsion member.

In the accompanying drawings Figure 1 is a plan view of my improved tool.

Figure 2 is a longitudinal mid-sectional View of the tool taken on the line 2-2 of Figure 1. Y

Figure 3 is a plan section taken through the line 3 3 of Figure 2 and illustrating the deflection of the longitudinal torsion member.

Numerous forms of torsion wrenches have been devised for the purpose of obviating the application of torsional force to the work piece `which would overstrain or injure the same.` Suchidevices have employed a resilient yielding means between the load applying member and the portion engaging the work piece and in these devices various forms of indicators have been arranged, either connected with the work engaging member or the resilient member, to indicate the extent of the torsional load applied.

In the present invention it is proposed to utilize the resilient load applying member directly as the load indicating means.

In the construction herein shown a tubular handle member I having an enlarged end 2 is threaded into a cylindrical portion 3 of a hollow head 4.

Mounted within the head 4 in angular relation to the handle I is a bushing 5 in which is journalled a spindle 6, the outer end of which, projecting beyond the head, is fashioned to carry a 5 Claims. (Cl. 73-139) suitable Work engaging tool, such as wrench or screw` driver bit. v A

The inner end-ofthe spindle Erhas formed thereon or rigidly securedthereto .aV bevel gear quadrant 1 which is shown as having its upper face engaging a bearing surface 8 of a cap 9 threaded in a threaded orifice in the topof the head 4.

A bushing I0 is mounted in the end of the tubu lar handle member extending intothe head 4. A bevel pinion II having a cylindrical stem I2 journalled in the bushing I0 is housed in the hollow head 4 and meshes with the bevel gear quadrant r1 so that any rotative movement of the spindle 6 within its bearing will be imparted to the pinion.

The stem I2 of the pinion II is formedwith a longitudinal and axial slot I3.

A torsion member I4, here shown as a flat strip of material, the dimensions and characteristics kof whichl will be suitably proportioned to the desired loading of the tool, has one end inserted in the slot I3 of the pinion stemand said strip extends longitudinally within the tubular handle and has its outer end housed in an axial longitudinal'slot I5 in a headed cylindrical member I6 rigidlysecured in the outer end of thehandle by a cross pin I1.

The tubular handle a socket I is provided witha narrow longitudinal slot or slots I8 which is parallel with I one longitudinal` edge of the torsion member A I4 and suitable gauge marks I9 are arranged on the outer surface of the tube along the edge of the slot.

It will be understood that a row of holes may be substituted for the slots I8.

' The upper edge of the torsion member will be suitably lplated or colouredfto present a contrasting appearance to the colour of the handle tube, the interior wall of which may also be contrastingly coloured as desired so that the relative position of the edge of the torsion member and the edge of the longitudinal slot or holes may be readily observed.

When the tool is unloaded the edge of the torsion strip will be visible and in line throughout the entire length of the slot or row of holes.

Upon the application of a load to the work piece, the turning movement of the tool causes the spindle 6 to turn in its bearing and through the gears 1 and II such movement will be imparted to the torsion member I4 and as its outer end is anchored, such member will be deflected into helicoidal form. Y

As the torsion member is thus deflected the edge thereof will be moved out of alignment with the 

